CN118373615A - Moderate heat silicate cement and preparation method thereof - Google Patents
Moderate heat silicate cement and preparation method thereof Download PDFInfo
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- CN118373615A CN118373615A CN202410491599.7A CN202410491599A CN118373615A CN 118373615 A CN118373615 A CN 118373615A CN 202410491599 A CN202410491599 A CN 202410491599A CN 118373615 A CN118373615 A CN 118373615A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 73
- 239000003469 silicate cement Substances 0.000 title claims abstract description 30
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims abstract description 69
- 239000010440 gypsum Substances 0.000 claims abstract description 61
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 61
- 150000001875 compounds Chemical class 0.000 claims abstract description 54
- 239000004568 cement Substances 0.000 claims abstract description 38
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000005751 Copper oxide Substances 0.000 claims abstract description 34
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910000431 copper oxide Inorganic materials 0.000 claims abstract description 34
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims abstract description 34
- 229910052939 potassium sulfate Inorganic materials 0.000 claims abstract description 34
- 235000011151 potassium sulphates Nutrition 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 34
- 239000011398 Portland cement Substances 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 25
- 239000000843 powder Substances 0.000 claims description 24
- 238000000227 grinding Methods 0.000 claims description 20
- 150000003839 salts Chemical class 0.000 claims description 19
- 238000010304 firing Methods 0.000 claims description 17
- 238000001816 cooling Methods 0.000 claims description 13
- 238000000354 decomposition reaction Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 11
- 239000004927 clay Substances 0.000 claims description 10
- 239000010881 fly ash Substances 0.000 claims description 10
- 235000019738 Limestone Nutrition 0.000 claims description 9
- 239000010459 dolomite Substances 0.000 claims description 9
- 229910000514 dolomite Inorganic materials 0.000 claims description 9
- 239000006028 limestone Substances 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 7
- 238000001354 calcination Methods 0.000 claims description 2
- -1 sandstone Substances 0.000 claims description 2
- 230000036571 hydration Effects 0.000 abstract description 5
- 238000006703 hydration reaction Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 4
- 235000012054 meals Nutrition 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 11
- 239000002131 composite material Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- FCZCIXQGZOUIDN-UHFFFAOYSA-N ethyl 2-diethoxyphosphinothioyloxyacetate Chemical compound CCOC(=O)COP(=S)(OCC)OCC FCZCIXQGZOUIDN-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of cement, and particularly discloses moderate heat silicate cement and a preparation method thereof. The moderate heat silicate cement comprises the following raw materials in parts by weight: 80-90 parts of clinker, 3-8 parts of compound and 3-7 parts of gypsum; the raw materials of the compound comprise copper oxide, calcium sulfate, potassium sulfate and iron powder. The preparation method of the moderate heat silicate cement comprises the following steps: and (3) uniformly stirring and mixing the clinker, the compound and the gypsum to obtain the moderate heat silicate cement. In the application, the compound formed by copper oxide, calcium sulfate, potassium sulfate and iron powder is added into the cement, the calcium sulfate and the potassium sulfate in the compound can improve the hydration rate of the cement, and the copper oxide and the iron powder are matched, so that the strength of the finally prepared cement is improved; and the raw materials are all environment-friendly materials, so that the prepared cement is more environment-friendly.
Description
Technical Field
The application relates to the technical field of cement, in particular to moderate heat silicate cement and a preparation method thereof.
Background
In recent years, the construction speed of the dam in China is continuously increased, but the problem of concrete cracking is not solved well, and cement is one of the most critical factors influencing concrete cracking in terms of materials. The conventional cement has a low hydration rate, so that the strength of the cement is general, and therefore, a cement with high strength needs to be researched.
Disclosure of Invention
In order to improve the strength of the prepared cement, the application provides moderate heat silicate cement and a preparation method thereof.
In a first aspect, the application provides moderate heat portland cement, which adopts the following technical scheme:
The moderate heat silicate cement comprises the following raw materials in parts by weight: 80-90 parts of clinker, 3-8 parts of compound and 3-7 parts of gypsum; the raw materials of the compound comprise copper oxide, calcium sulfate, potassium sulfate and iron powder.
By adopting the technical scheme, the compound formed by the copper oxide, the calcium sulfate, the potassium sulfate and the iron powder is added into the cement, the calcium sulfate and the potassium sulfate in the compound can improve the hydration rate of the cement, and the copper oxide and the iron powder are matched, so that the strength of the finally prepared cement is improved; and the raw materials are all environment-friendly materials, so that the prepared cement is more environment-friendly.
In a specific embodiment, the method of preparing the complex comprises the steps of:
and (3) uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling, firing, cooling and grinding to obtain a compound.
By adopting the technical scheme, the copper oxide, the calcium sulfate, the potassium sulfate and the iron powder are firstly mixed, then rolled, fired, cooled and ground to obtain the compound.
In a specific embodiment, the firing temperature is 350 to 450 ℃ and the firing time is 1.5 to 2 hours.
By adopting the technical scheme, the firing temperature and time are further limited, so that the quality of the prepared compound is improved.
In a specific embodiment, the weight ratio of the copper oxide, the calcium sulfate, the potassium sulfate and the iron powder is 1: (2-3): (1-2): (0.8-0.9).
By adopting the technical scheme, the proportion of copper oxide, calcium sulfate, potassium sulfate and iron powder in the compound is further limited, so that the effect of preparing the compound is improved.
In a specific possible embodiment, the raw materials of the clinker comprise the following components in parts by weight: 65-75 parts of limestone, 10-15 parts of sandstone, 5-10 parts of dolomite, 5-10 parts of converter slag, 5-8 parts of clay and 1-5 parts of fly ash.
By adopting the technical scheme, the clay and the fly ash are added into the raw materials of the clinker, so that the strength of the prepared cement can be further improved.
In a specific embodiment, the method for preparing clinker comprises the steps of:
Uniformly stirring and mixing limestone, sandstone, dolomite, converter slag, clay and fly ash, adding water, grinding to prepare slurry, continuously uniformly stirring, adding water in the middle to prepare slurry with the water content of 33-36%;
dehydrating the slurry to form a filter cake having a moisture content of less than 18%; then drying to obtain raw material powder with water content of 1-2%; decomposing the raw material powder to make the decomposition rate of carbonate be greater than or equal to 88%, then calcining, cooling and crushing to obtain clinker.
By adopting the technical scheme, the raw materials are stirred and mixed uniformly, water is added for grinding to prepare slurry, then the slurry is dehydrated and dried to obtain raw material powder, and finally the raw material powder is decomposed, calcined, cooled and crushed to obtain clinker with higher strength.
In a specific embodiment, the gypsum comprises a salt gypsum.
By adopting the technical scheme, the main components of the gypsum salt are calcium sulfate dihydrate and calcium carbonate, so that the yield stress and plastic viscosity of the cement paste can be improved, and the thixotropic property of the paste can be enhanced.
In a second aspect, the application provides a method for preparing moderate heat portland cement, which adopts the following technical scheme:
the preparation method of the moderate heat silicate cement comprises the following steps:
and (3) uniformly stirring and mixing the clinker, the compound and the gypsum to obtain the moderate heat silicate cement.
By adopting the technical scheme, the raw material clinker, the compound and the gypsum are stirred and mixed uniformly to obtain the moderate heat silicate cement with higher strength.
In summary, the present application includes at least one of the following beneficial technical effects:
1. In the application, the compound formed by copper oxide, calcium sulfate, potassium sulfate and iron powder is added into the cement, the calcium sulfate and the potassium sulfate in the compound can improve the hydration rate of the cement, and the copper oxide and the iron powder are matched, so that the strength of the finally prepared cement is improved; the raw materials are all environment-friendly materials, so that the prepared cement is more environment-friendly;
2. The raw materials are stirred and mixed uniformly, water is added for grinding to prepare slurry, the slurry is dehydrated and dried to obtain raw material powder, the raw material powder is decomposed finally, and then the raw material powder is calcined, cooled and crushed to obtain clinker with higher strength;
3. The method of the application is to stir and mix the raw material clinker, the compound and the gypsum uniformly to obtain the moderate heat silicate cement with higher strength.
Detailed Description
The present application will be described in further detail with reference to examples.
All the starting materials in the examples are commercially available.
Preparation example
Preparation example 1
Preparation example 1 provides a preparation method of a compound, comprising the following steps:
Uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 350 ℃ for 1.5h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:1.5:0.5:0.75.
Preparation example 2
Preparation example 2 provides a preparation method of a compound, comprising the following steps:
Uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:1.5:0.5:0.75.
Preparation example 3
Preparation example 3 provides a method for preparing a composite, comprising the following steps:
Uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 450 ℃ for 2 hours, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:1.5:0.5:0.75.
Preparation example 4
Preparation example 4 provides a method for preparing a composite, comprising the following steps:
uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:2:1:0.8.
Preparation example 5
Preparation example 5 provides a method for preparing a composite comprising the steps of:
uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:2.5:1.5:0.85.
Preparation example 6
Preparation example 6 provides a method for preparing a composite comprising the steps of:
Uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:3:2:0.9.
Preparation example 7
Preparation 7 provides a method for preparing a compound, comprising the following steps:
uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1:3.5:2.5:0.95.
Preparation example 8
Preparation 8 provides a method for preparing a compound, comprising the following steps:
stirring and mixing calcium sulfate and potassium sulfate uniformly, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; the weight ratio of the calcium sulfate to the potassium sulfate is 2.5:1.5.
Preparation example 9
Preparation example 9 provides a method for preparing a composite comprising the steps of:
Uniformly stirring and mixing copper oxide and iron powder, rolling to obtain a round cake with the diameter of 1.5cm, firing at 400 ℃ for 1.7h, cooling and grinding to obtain a compound; wherein the weight ratio of the copper oxide to the iron powder is 1:0.85.
Preparation example 10
Preparation example 10 provides a method for preparing clinker, comprising the following steps:
Uniformly stirring and mixing 65kg of limestone, 10kg of sandstone, 5kg of dolomite, 5kg of converter slag, 5kg of clay and 1kg of fly ash, adding water, grinding to prepare slurry, continuously uniformly stirring, and adding water in the middle to prepare slurry with the water content of 33%;
dewatering the slurry by using a vacuum suction filter to form a filter cake with 17% of water; then adding the filter cake into a drying crusher for drying to obtain raw meal powder with the water content of 1%;
The raw meal powder is added into a decomposing furnace for decomposition, so that the decomposition rate of carbonate is more than or equal to 88 percent, then the raw meal powder is calcined at 1100 ℃, cooled to 150 ℃ and crushed, and clinker is obtained.
PREPARATION EXAMPLE 11
Preparation 11 provides a method for preparing clinker, comprising the following steps:
Mixing 70kg of limestone, 12.5kg of sandstone, 8kg of dolomite, 8kg of converter slag, 6.5kg of clay and 3kg of fly ash uniformly, adding water, grinding to prepare slurry, continuously stirring uniformly, and adding water halfway to prepare slurry with the water content of 33%; dewatering the slurry by using a vacuum suction filter to form a filter cake with 17% of water; then adding the filter cake into a drying crusher for drying to obtain raw meal powder with the water content of 1%;
The raw meal powder is added into a decomposing furnace for decomposition, so that the decomposition rate of carbonate is more than or equal to 88 percent, then the raw meal powder is calcined at 1100 ℃, cooled to 150 ℃ and crushed, and clinker is obtained.
Preparation example 12
Preparation example 12 provides a method for preparing clinker, comprising the following steps:
Mixing 75kg of limestone, 15kg of sandstone, 10kg of dolomite, 10kg of converter slag, 8kg of clay and 5kg of fly ash uniformly, adding water, grinding to prepare slurry, continuously stirring uniformly, and adding water halfway to prepare slurry with the water content of 33%;
dewatering the slurry by using a vacuum suction filter to form a filter cake with 17% of water; then adding the filter cake into a drying crusher for drying to obtain raw meal powder with the water content of 1%;
The raw meal powder is added into a decomposing furnace for decomposition, so that the decomposition rate of carbonate is more than or equal to 88 percent, then the raw meal powder is calcined at 1100 ℃, cooled to 150 ℃ and crushed, and clinker is obtained.
Preparation example 13
Preparation example 13 provides a method for preparing clinker, comprising the following steps:
Mixing 70kg of limestone, 12.5kg of sandstone, 8kg of dolomite, 8kg of converter slag, 6.5kg of clay and 3kg of fly ash uniformly, adding water, grinding to prepare slurry, continuously stirring uniformly, and adding water halfway to prepare slurry with the water content of 34.5%; dewatering the slurry by using a vacuum suction filter to form a filter cake with water content of 16%; then adding the filter cake into a drying crusher for drying to obtain raw meal powder with the water content of 1.5%;
The raw meal powder is added into a decomposing furnace for decomposition, so that the decomposition rate of carbonate is more than or equal to 88 percent, then the raw meal powder is calcined at 1100 ℃, cooled to 150 ℃ and crushed, and clinker is obtained.
PREPARATION EXAMPLE 14
Preparation example 14 provides a method for preparing clinker, comprising the following steps:
mixing 70kg of limestone, 12.5kg of sandstone, 8kg of dolomite, 8kg of converter slag, 6.5kg of clay and 3kg of fly ash uniformly, adding water, grinding to prepare slurry, continuously stirring uniformly, and adding water halfway to prepare slurry with the water content of 36%; dewatering the slurry by using a vacuum suction filter to form a filter cake with 15% of water; then adding the filter cake into a drying crusher for drying to obtain raw meal powder with water content of 2%;
The raw meal powder is added into a decomposing furnace for decomposition, so that the decomposition rate of carbonate is more than or equal to 88 percent, then the raw meal powder is calcined at 1100 ℃, cooled to 150 ℃ and crushed, and clinker is obtained.
Examples
Example 1
Example 1 provides a method for preparing moderate heat portland cement, comprising the following steps:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 1 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 2
Example 2 provides a method for preparing moderate heat portland cement, comprising the following steps:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 2 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 3
Example 3 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 3 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 4
Example 4 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 4 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 5
Example 5 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 5 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 6
Example 6 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 6 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 7
Example 7 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 7 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 8
Example 8 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 11, 3kg of compound in preparation example 5 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 9
Example 9 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 12, 3kg of compound in preparation example 5 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 10
Example 10 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 13, 3kg of compound in preparation example 5 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 11
Example 11 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 14, 3kg of compound in preparation example 5 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 12
Example 12 provides a method for preparing moderate heat portland cement, comprising the steps of:
85kg of clinker in preparation example 13, 5.5kg of compound in preparation example 5 and 5kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Example 13
Example 13 provides a method for preparing moderate heat portland cement, comprising the steps of:
90kg of clinker in preparation example 13, 8kg of compound in preparation example 5 and 7kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Comparative example
Comparative example 1
Comparative example 1 provides a method for preparing moderate heat portland cement, comprising the steps of:
83kg of clinker in preparation example 10 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Comparative example 2
Comparative example 2 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 8 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Comparative example 3
Comparative example 3 provides a method for preparing moderate heat portland cement, comprising the steps of:
80kg of clinker in preparation example 10, 3kg of compound in preparation example 9 and 3kg of gypsum are stirred and mixed uniformly to obtain moderate heat silicate cement; wherein the gypsum is salt gypsum.
Performance test intensity: the cement in each example was tested according to GB/T17671-1999 cement mortar Strength test, and 28-day compressive and flexural strength was obtained.
TABLE 1 Performance test results of cements
| Sample of | Compressive strength (MPa) | Flexural strength (MPa) |
| Example 1 | 6.8 | 45.0 |
| Example 2 | 7.0 | 46.2 |
| Example 3 | 6.8 | 45.3 |
| Example 4 | 7.3 | 47.9 |
| Example 5 | 7.5 | 48.2 |
| Example 6 | 7.5 | 48.0 |
| Example 7 | 7.0 | 46.5 |
| Example 8 | 7.8 | 48.7 |
| Example 9 | 7.6 | 48.3 |
| Example 10 | 8.0 | 49.3 |
| Example 11 | 7.9 | 49.0 |
| Example 12 | 8.3 | 49.4 |
| Example 13 | 8.1 | 49.1 |
| Comparative example 1 | 4.1 | 31.2 |
| Comparative example 2 | 5.9 | 40.5 |
| Comparative example 3 | 6.0 | 41.1 |
In combination with examples 1 and comparative examples 1 to 3, the cement in example 1 has the highest strength, and it can be seen that when the cement is prepared, a compound composed of copper oxide, calcium sulfate, potassium sulfate and iron powder is added, the calcium sulfate and the potassium sulfate in the compound can increase the hydration rate of the cement, and the strength of the finally prepared cement can be increased by matching the copper oxide with the iron powder.
In combination with examples 1-3, the cement of example 2 had the highest strength, and it was found that the firing conditions in preparation example 2 were optimal when preparing the composite, and thus the cement of example 2 had the best strength.
In combination with examples 2 and 4-7, the cements of examples 4-6 have higher strengths, and it can be seen that the proportions of copper oxide, calcium sulfate, potassium sulfate, and iron powder are preferably 1: (2-3): (1-2): (0.8-0.9), so that the strength of the finally prepared cement is higher.
In combination of examples 5, 8 and 9, the cement of example 8 has the highest strength, and it can be seen that in preparing clinker, the use amount of raw materials is increased, and the performance of the prepared clinker tends to be improved and then reduced.
In combination of examples 8, 10 and 11, the cement of example 10 has the highest strength, and it can be seen that in preparing clinker, the production conditions of preparation example 13 are optimal, so that the final cement has higher strength.
In combination of examples 10, 12 and 13, the cement of example 12 had the highest strength, and it was found that in the preparation of cement, the strength of the cement produced tended to rise and then fall by increasing the amount of raw materials used.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (8)
1. A moderate heat portland cement, characterized by: the cement comprises the following raw materials in parts by weight: 80-90 parts of clinker, 3-8 parts of compound and 3-7 parts of gypsum; the raw materials of the compound comprise copper oxide, calcium sulfate, potassium sulfate and iron powder.
2. A moderate-heat portland cement according to claim 1, wherein: the preparation method of the compound comprises the following steps:
and (3) uniformly stirring and mixing copper oxide, calcium sulfate, potassium sulfate and iron powder, rolling, firing, cooling and grinding to obtain a compound.
3. A moderate-heat portland cement according to claim 2, wherein: the firing temperature is 350-450 ℃ and the firing time is 1.5-2h.
4. A moderate-heat portland cement according to claim 3, wherein: the weight ratio of the copper oxide to the calcium sulfate to the potassium sulfate to the iron powder is 1: (2-3): (1-2): (0.8-0.9).
5. A moderate-heat portland cement according to claim 1, wherein: the clinker comprises the following raw materials in parts by weight: 65-75 parts of limestone, 10-15 parts of sandstone, 5-10 parts of dolomite, 5-10 parts of converter slag, 5-8 parts of clay and 1-5 parts of fly ash.
6. The moderate heat portland cement according to claim 5, wherein: the preparation method of the clinker comprises the following steps:
uniformly stirring and mixing limestone, sandstone, dolomite, converter slag, clay and fly ash, adding water, grinding to prepare slurry, continuously uniformly stirring, and adding water in the middle to prepare slurry with the water content of 33-36%;
dehydrating the slurry to form a filter cake having a moisture content of less than 18%; then drying to obtain raw material powder with water content of 1-2%;
decomposing the raw material powder to make the decomposition rate of carbonate be greater than or equal to 88%, then calcining, cooling and crushing to obtain clinker.
7. A moderate-heat portland cement according to claim 1, wherein: the gypsum includes salt gypsum.
8. A method for preparing moderate heat portland cement according to any one of claims 1 to 7, wherein: the method comprises the following steps:
and (3) uniformly stirring and mixing the clinker, the compound and the gypsum to obtain the moderate heat silicate cement.
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